My mom still uses an old Power Macintosh G3 All-in-One, with MacOS 8 installed on it. While it still suits her needs (email and web browsing) for the most part, I’ve been thinking of how to upgrade or replace it. Here are some links that I have found about the topic.
http://lowendmac.com/ppc/g3aio.shtml
http://eshop.macsales.com/OSXCenter/XPostFacto/Framework.cfm?page=XPostFacto3.html
http://lowendmac.com/stotler/06/0731.html
http://lowendmac.com/misc/06/0628.html
http://lowendmac.com/thompson/06/0103.html
http://lowendmac.com/misc/06/0515.html
http://wamcom.org/
http://icab.de/